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Research

Papers, sources and cited answers. 12 tools checked. Lists are never ranked: the order is A to Z, lowest starting price, or free plan first, whichever you pick.

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AskYourPDFFreemium
Chat-with-your-PDF tool with OCR, a Chrome extension and a research assistant.
From $11.99/mo billed yearly (Premium) Free plan
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Connected PapersFreemium
Visual tool that builds a graph of papers related to one paper you enter, to explore an academic field.
From $6/mo billed yearly (Academic) Free plan
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ConsensusFreemium
AI search engine for research that answers questions from scholarly papers and links every sentence back to the source paper.
From $20/mo (Pro) Free plan
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ElicitFreemium
Research assistant that searches academic papers, summarises them and extracts data into tables. The free tier covers search and chat with papers; paid tiers add more agent and review usage.
From $11/mo billed yearly (Plus) Free plan
Unverified Last checked Sources disagree
HumataFreemium
AI assistant that answers questions about your uploaded PDFs and documents.
From $9.99/mo (Expert) Free plan
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KagiPaid
A paid search engine with no ads and no tracking of your searches. Paid plans add an AI assistant, a summarizer and a translator.
From $5/mo (Starter) No free plan
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NotebookLMFreemium
Google's research and notes tool. You upload documents, notes or links, then ask questions, get summaries and make audio or video overviews based only on those sources.
From $4.99/mo (Google AI Plus) Free plan
Unverified Last checked Sources disagree
PaperpalFreemium
AI writing assistant for academic and research writing: language suggestions, paraphrasing, citations, plagiarism checks and PDF chat.
From $25/mo (Prime) Free plan
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PDF.aiFreemium
Chat-with-your-PDF tool with OCR, a Chrome extension and AI agents, plus separate document-parsing APIs.
From $10/mo billed yearly (Pro) Free plan
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PerplexityFreemium
Answer engine that searches the web and replies with cited sources. Free tier covers core search; paid plans add more in-depth searches, file uploads and advanced models.
From $10/mo (Education Pro) Free plan: 3 Pro Searches per day
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ReadwisePaid
Saves your highlights from books and articles and brings them back for review. Reader is its read-it-later app for articles, PDFs, EPUBs, emails and videos.
From $6.99/mo (Highlights Lite) No free plan
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SciSpaceFreemium
AI research workspace for finding papers, chatting with PDFs, extracting data, running literature reviews and writing with citations.
From $20/mo (Premium) Free plan
Unverified Last checked Sources disagree